Group 1 - The weather conditions, including heavy snow and freezing rain, have led to significant disruptions in transportation, particularly affecting train services and flights in Nanjing [1][2] - The railway department has implemented temporary train suspensions on key high-speed rail lines from 11 AM to midnight on January 20, with plans for dynamic adjustments based on weather developments [1] - At Nanjing Lukou International Airport, 13 out of 576 planned flights were canceled due to the weather, primarily affecting routes to and from the southwest [2] Group 2 - The airport has taken measures to ensure flight safety, including deploying de-icing vehicles and manual snow removal for departing flights [2] - Travelers are advised to stay updated on flight statuses and weather changes at both departure and arrival locations to avoid travel delays [4]